The directional derivative of the function f(x, y) = x2 + y2 along a l – McqOptions

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1.	The directional derivative of the function f(x, y) = x2 + y2 along a line directed from (0,0) to (1,1), evaluated at the point x = 1, y = 1 is
A.	√2
B.	2
C.	2√2
D.	4√2
Answer» D. 4√2

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